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softfloat: For Mips only, correct default NaN values

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Only for Mips platform, and only for cases when snan_bit_is_one is 0,
correct default NaN values (in their 16-, 32-, and 64-bit flavors).

For more info, see [1], page 84, Table 6.3 "Value Supplied When a New
Quiet NaN Is Created", and [2], page 52, Table 3.7 "Default NaN
Encodings".

[1] "MIPS Architecture For Programmers Volume II-A:
The MIPS64 Instruction Set Reference Manual",
Imagination Technologies LTD, Revision 6.04, November 13, 2015

[2] "MIPS Architecture for Programmers Volume IV-j:
The MIPS32 SIMD Architecture Module",
Imagination Technologies LTD, Revision 1.12, February 3, 2016

Backports commit a7c04d545a97126c9df9d96623747d8613aaf7db from qemu
This commit is contained in:
Aleksandar Markovic 2018-02-24 20:38:21 -05:00 committed by Lioncash
parent 33ee9429b2
commit 33833b6605
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 12 additions and 0 deletions
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12
qemu/fpu/softfloat-specialize.h
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@ -97,7 +97,11 @@ float16 float16_default_nan(float_status *status)
if (status->snan_bit_is_one) {
return const_float16(0x7DFF);
} else {
#if defined(TARGET_MIPS)
return const_float16(0x7E00);
#else
return const_float16(0xFE00);
#endif
}
#endif
}
@ -116,7 +120,11 @@ float32 float32_default_nan(float_status *status)
if (status->snan_bit_is_one) {
return const_float32(0x7FBFFFFF);
} else {
#if defined(TARGET_MIPS)
return const_float32(0x7FC00000);
#else
return const_float32(0xFFC00000);
#endif
}
#endif
}
@ -134,7 +142,11 @@ float64 float64_default_nan(float_status *status)
if (status->snan_bit_is_one) {
return const_float64(LIT64(0x7FF7FFFFFFFFFFFF));
} else {
#if defined(TARGET_MIPS)
return const_float64(LIT64(0x7FF8000000000000));
#else
return const_float64(LIT64(0xFFF8000000000000));
#endif
}
#endif
}